Abstract
IN THE first two reports of this series, studies were conducted to determine the effects of such factors as age, sex and feather growth rate on feather phaeomelanin density (Somes and Smyth, 1965a) and the inheritance of quantitative differences in phaeomelanin pigment from whole feather extracts in three breeds of gold columbian fowl (Somes and Smyth, 1965b). However, studies utilizing whole feather extracts represent a mixture of different phaeomelanin fractions (Nickerson, 1946; Smyth et al., 1951) and provide no information on the relative contributions of each in either pure stocks or cross progeny. Smyth et al. (1951) separated whole feather extracts of both red and buff colored feathers into four different fractions. Two of these, brown I and brown II, appear to be typical melanins, while the other two, called dark purple and red purple by Smyth et al. (1951), are similar to each other and have chemical properties which…
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